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âge d'argon

См. также в других словарях:

  • argon — /ahr gon/, n. Chem. a colorless, odorless, chemically inactive, monatomic, gaseous element that, because of its inertness, is used for filling fluorescent and incandescent lamps and vacuum tubes. Symbol: Ar; at. no.: 18; at. wt.: 39.948. [1890… …   Universalium

  • Argon–argon dating — Argon argon (or 40Ar/39Ar) dating is a radiometric dating method invented to supersede potassium argon (K Ar) dating in accuracy. In this technique, the decay of 40K to 40Ar* (* indicates radiogenic) is used to date geological events,… …   Wikipedia

  • Argon — Chlore ← Argon → Potassium Ne …   Wikipédia en Français

  • Argon — This article pertains to the chemical element. For other uses, see Argon (disambiguation). Argon (pronEng|ˈɑrgɒn) is a chemical element designated by the symbol Ar. Argon has atomic number 18 and is the third element in group 18 of the periodic… …   Wikipedia

  • Argon Zark! — Infobox webcomic| title = Argon Zark! caption = author = Charley Parker url = http://www.zark.com status = Irregularly began = June 1995 ended = genre = ratings = Argon Zark! is a webcomic, created by cartoonist and web site designer Charley… …   Wikipedia

  • Argon (Terre du Milieu) — Liste des Elfes de la Terre du Milieu Voici une liste des Elfes apparaissant dans l œuvre fictionnelle de J. R. R. Tolkien. Sommaire : Haut A B C D E F G H I J K L M N O P Q R S T U V W X Y Z …   Wikipédia en Français

  • Age of the Earth — This article is about scientific estimates of the age of the Earth. For religious and other non scientific estimates, see Dating Creation. Earth as seen from Apollo 17 The age of the Earth is 4.54 billion years (4.54 × 109 years ± 1%) …   Wikipedia

  • potassium-argon dating — /peuh tas ee euhm ahr gon/, Geol. a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon. [1965 70] * * * Method for determining the age of igneous rocks based on the… …   Universalium

  • POTASSIUM-ARGON (DATATION PAR LE) — POTASSIUM ARGON DATATION PAR LE L’isotope, de masse atomique 40, du potassium est radioactif. Deux autres isotopes, respectivement de masses 39 et 41, constituent, dans des proportions de 93,22 p. 100 et de 6,77 p. 100, le potassium naturel.… …   Encyclopédie Universelle

  • The Eye of Argon — infobox Book | name = The Eye of Argon title orig = translator = image caption = author = Jim Theis illustrator = cover artist = country = US language = English series = genre = Heroic fantasy publisher = Wildside Press (2006 reprint) release… …   Wikipedia

  • Datation Au Potassium-argon — La datation au potassium argon (ou K Ar) est une méthode de datation radiométrique qui permet de déterminer l âge d un échantillon de roche par la mesure des concentrations relatives du couple d isotopes potassium 40 / argon 40. Description… …   Wikipédia en Français

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